79 KING: KADAPAH AND KARNÜL FORMATIONS. [PART If: 
as those just described ; and they are the best building material in the 
whole series. The fawn-colored and buff beds are extremely compact, 
very fine-grained and very splintery, breaking off with edges as sharp as 
a knife. 
Itis very seldom that allthese varieties are found in one section, 
RT TL for the bands thin out and disappear in In ELi 
parts of the field ; but 1f such a complete series could 
be found it would show that the earthy grey beds are uppermost ; that the 
compact black, blue, and grey beds are about a middle band, with the 
base of which the splintery varieties are associated; and that lowest of 
all comes a further set of grey beds, which are, however, different from the. 
upper greys in that they are hard, compact, and splintery like the blue 
beds, and contain purple beds with segregations of dark purple. chert 
in odd-shaped strings, knots, and lamine. This is about the general 
succession all over the field. 
“The second of these three structures is yet more enigmatical in character and ap- 
pearances, and somewhat less strikingly like an organic body in its general aspect than 
the foregoing. 
* [t may be compared in appearance to a very much weathered specimen of a fungoid 
coral having the large vertical plates very far apart and showing no minute cellular struc- 
ture. The vertical plates generally radiate from a clear but slightly depressed space of 
either circular or elongated elliptical shape, according to the distribution of the plates. 
The plates very rarely meet at the apical space in the circular, or across the centrically 
depressed ridge in the elongated, examples where these are best developed. 
* The spaces between the vertical plates are occupied by limestone which is generally 
weathered down to a level of from 2 to 2 of an inch below the ridges formed by the plates 
in large specimens. The lateral distance between the plates at the apex or summit 
ridge is very variable, but is generally less than $ an inch; and the divergence in the cir- 
cular specimens is necessarily larger than in the elongated forms. 
< The third form alluded to is, in structure, a substance intermediate to the first two, 
having the delicacy of the first in great measure and an approach to the vertical arrange- 
ment of the plates of silicious matter along the outer margin of the area covered with the 
perforated film. In this kind, the central part is, as a rule, elevated an inch or 13 inch 
above the plane to which the furthest and lowest ends of the vertical fringing plates may 
extend. 
* These quasi-organie bodies were not observed in any of the older or younger lime- 
stones of these newer metamorphic groups of rocks." As I have written above, 1 have since. 
seen the coralloid form of weathering in the Koilkoontla Limestones.—W. K. 
CR) 
